Benzimidazole Based Hole-Transporting Materials for High-performance Inverted Perovskite Solar Cells

Yogesh S. Tingare, Chaochin Su, Ja Hon Lin, Yi Chun Hsieh, Hong Jia Lin, Ya Chun Hsu, Meng Che Li, Guan Lin Chen, Kai Wei Tseng, Yi Hsuan Yang, Leeyih Wang, Hsinhan Tsai, Wanyi Nie, Wen Ren Li

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

Interfaces play a decisive role in perovskite solar cells’ power conversion efficiency and their long-term durability. Small-molecule hole-transporting materials (HTMs) have grabbed enormous attention due to their structural flexibility, material properties, and stabilities, allowing for improved operational durability in perovskite photovoltaics. This study synthesizes and investigates a new class of benzimidazole-based small molecules, named YJS001 and YJS003, serving as the HTMs to enable high-efficiency mixed-cation mixed-halide perovskite solar cells. The benzimidazole-based materials are dopant-free HTMs composed of donor and acceptor building blocks that are designed to engineer the energy level alignment near the HTM/perovskite interface. Mixed-cation mixed-halide perovskites can be grown uniformly on both HTMs with large crystalline grains. It is discovered that the donor-rich YJS003-based solar cell exhibits a high open-circuit voltage of 1.09 V with a champion power conversion efficiency of over 20%. Power-dependent current–voltage characteristics of the solar cells are analyzed, from which the high performance of YJS003's excellent hole mobility and well-aligned energy level is attributed. This work introduces a new class of benzimidazole-based small molecules as HTMs, that paves the path for dopant free interface material development for commercialization of perovskite solar cells.

Original languageEnglish
Article number2201933
JournalAdvanced Functional Materials
Volume32
Issue number33
DOIs
StatePublished - 15 Aug 2022

Keywords

  • benzimidazole
  • dopant-free hole transport materials
  • hole mobility
  • inverted perovskite solar cells
  • perovskite absorbers

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